反应详情

3-Bromofuro[2,3-c]pyridine-5-carbaldehyde (3.26 g, 14.42 mmol) is dissolved in THF (100 mL)/t-BuOH (50 mL)/H2O (50 mL), treated with a single portion of NaOCl2 (4.89 g, 43.3 mmol) and KH2PO4 (3.92 g, 28.8 mmol) and stirred at rt for 18 h. The white solid is collected via filtration and the filtrate is concentrated in vacuo to dryness. The residue is suspended in water (25 mL), acidified to pH 2 with concentrated HCl and the resulting solid collected via filtration. The collected solids are dried in a vacuum oven at 50° C. for 18 h and combined to afford 3.52 g (99%) of 3-bromofuro[2,3-c]pyridine-5-carboxylic acid as a white solid. MS (EI) m/z: 241 (M+).

1. filtrationThe white solid is collected via filtration
2. concentrationthe filtrate is concentrated in vacuo to dryness
3. filtrationthe resulting solid collected via filtration
4. customThe collected solids are dried in a vacuum oven at 50° C. for 18 h